JPS6338059Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is used in the field of removably holding a plurality of forging dies used in a multi-stage forging machine at predetermined positions on the machine. used. That is, the present invention relates to an improvement of the forging die holding device in the above-mentioned molding machine.

[Prior art and its problems]

By the way, in a multi-stage forging machine that is configured to form bolts, nuts, or various parts by forging supplied materials step by step, it is possible to The forging dies are arranged in parallel at regular intervals so as to face the respective forging punches.

The plurality of forging dies are subjected to a strong impact load when the material supplied to each of them is struck by a forging punch, so care must be taken to ensure that they are held firmly when installed in the forming machine. There must be.

In addition, these forging dies are replaced each time the shape and dimensions of the forged product to be formed differ, and are also replaced when they become damaged or worn out, so the above arrangement makes it easy to replace them. must be maintained so that it can be used.

However, in the conventional way of holding the forging die, it is difficult to make it strong against impact loads.
For example, each die is individually placed in the die storage hole of the die block and fixed with a set bolt, so it is not easy to replace only one forging die, but when replacing all the forging dies, it takes a lot of effort. It takes time and effort and is very inefficient.

On the other hand, Utility Model Registration No. 1343312 (Utility Model Registration No. 1343312)
No. 40439) proposes a method for simplifying die replacement in such a multi-stage forging machine. In other words, in this known example, the entire die block (referred to as die holder 3 in the above publication) that holds a plurality of forging dies horizontally in the front and rear direction in parallel in the left and right direction is divided into upper and lower halves, and each die is are attached to the upper die block side with bolts perpendicular to the individual die center lines, and by placing this upper die block on the lower die block and fixing it with bolts, the above-mentioned Each die is adapted to be retained. Therefore, according to this known example, by separating the upper die block from the lower die block and moving it elsewhere, a plurality of forging dies can be removed from the molding machine together with the upper die block at the same time. It is expected that all of the forging dies can be replaced easily, and individual replacements can be carried out from a narrow space inside the molding machine to a wide space.

However, this known example has the following problems. That is, the forging die during forging is first subjected to a backward impact load due to the striking of the forging punch along the direction of the die center line, and then a forward reaction load is applied as the load is received. However, the rearward impact load is transmitted through members such as spacers or back plates placed behind the heading die.
Since it is transmitted to and received by the frame of the molding machine, there is no particular problem. However, the forward reaction load is transmitted and received in the following order: the forging die fixing bolt, the upper die block, the upper die block fixing bolt, the lower die block, and the frame of the molding machine. In particular, there is a great concern that applying a large shearing load to the former die fixing bolt may cause it to break early, and it is difficult to say that it is possible to firmly hold the forging die. In addition, in this known example, in order to reliably prevent the forging die and the upper die block from shifting in the front-back direction during forging, each of the fixing bolts for both of them must be strongly tightened. When replacing the forging die, it takes a surprising amount of time to attach and detach the upper die block to the lower die block and the forging die to the upper die block, and each time the die is replaced repeatedly, the screw threads of each fixing bolt and screw hole are severely worn out. There is a risk that it may become unusable at an early stage.

[Technical issues of invention]

Under these circumstances, the technical problem of the present invention is to provide a device that holds a plurality of forging dies with a die block divided into upper and lower halves, and to hold the forging dies more firmly and more quickly. The aim is to make possible exchanges.

[Technical means of invention]

The technical means of the present invention that addresses such technical problems is configured as follows. First, for a forging die that is horizontal in the front and back direction and is sandwiched between the upper and lower die blocks and bolted to the upper die block side, a vertical lock pin that passes through the upper die block and stands up from the lower die block is inserted.
It is engaged with the outer surface of the die in a direction perpendicular to the die center line. In addition, on both left and right sides of the upper die block, there are clamps that can be moved forward and backward by hydraulic drive.
Apply downward pressure to the left and right ends of the upper die block. Note that there is no difference from the conventional method in that the rear end of the forging die is brought into contact with the frame of the molding machine directly or via another member.

[Effect of invention]

In the technical means of the present invention configured as described above, the backward impact load applied to the forging die as the forging punch is struck is transmitted to the lower die block via the lock pin engaged with the die. , most of which is directly transmitted from the rear end of the die to the frame side of the molding machine and received. Therefore, in this respect, there is no difference from the conventional method.

However, with this technical means, the forward reaction load applied to the heading die following the above-mentioned impact load is immediately transmitted from the lock pin to the frame side of the molding machine via the lower die block and received, so that the load is reduced. There is no particular need to transmit the information from the die fixing bolt to the lower die block via the upper die block as in the conventional case. Therefore, with this technical means, the die fixing bolts are used merely for suspension, and it is sufficient that the forging die can be suspended on the upper die block side when separated from the lower die block; There is no need to tighten it as strongly as in For this reason, the suspension bolt may pass through the upper die block with a gap left around it, and in that case, the reaction load described above will not be unnecessarily transmitted to the upper die block side.
This is convenient for simplifying the fixing of the block.
For the same reason, the above-mentioned lock pin may also pass through the upper die block with a gap left around it, provided that it is tightly inserted into the lower die block.

In addition, with this technical means, there is no need to take into account the fact that a reaction load is applied to the upper die block side, so it is sufficient to fix the block by pressing it onto the lower die block. Attachment is achieved with left and right clamps that work downward. Since this clamp is moved forward and backward by hydraulic pressure, it is possible to fix or release the upper die block much faster than conventional die block fixing bolts.

[Effect of idea]

Therefore, according to the technical means of the present invention as described above, the forward reaction load applied to the forging die after striking by the forging punch is immediately transferred from the lower die block to the frame side of the molding machine using the lock pin and received. In addition, the transmission of the reaction load to the upper die block side can be almost ignored, and concerns such as breakage of the fixing bolt due to shear load, which was seen in the conventional known example mentioned above, can be avoided. Therefore, the effect of easily realizing even stronger holding of the forging die can be expected.

Furthermore, according to this technical means, since the upper die block is fixed using a hydraulically driven clamp, it is not time consuming to attach or detach the block to the lower die block, and there is no need to tighten the die suspension bolts too strongly. The forging die can be easily attached and detached from the upper die block, and since the lock pin does not fix the forging die in the vertical direction, it can be expected that the forging die can be replaced more quickly.

〔Example〕

Next, a specific embodiment of the above-described present invention in a multi-stage heading molding machine will be described with reference to the drawings.

First, in the embodiment shown in FIGS. 1 to 3, the die block that holds a plurality of forging dies 2 horizontally in the front-rear direction in parallel in the left-right direction has upper and lower parts 3 and 4.
It is divided into two parts, and the forging die group is sandwiched from above and below. However, the upper die block 3 in this embodiment has a configuration in which only the portion necessary for sandwiching the forging die group from above and below is divided from the lower die block 4, and therefore, on both left and right sides of the lower die block 4, Side walls 4a, 4a for positioning the upper die block 3 in the left and right directions are left, respectively, and a rear wall 4b for positioning each heading die 2 and the upper die block 3 in the rear direction is left at the back.

This lower die block 4 is assumed to be semi-permanently fixed to the frame side using known fixing means such as bolts or wedges (not shown) while being fitted into the frame 1 of the molding machine,
The member designated by the reference numeral 5 in FIG. 3 is a back plate inserted behind the block. On the other hand, the upper die block 3 is fitted into the lower die block 4 from above and is connected to the side wall 4a.
and wedge-shaped clamps 6 placed on both left and right sides while being positioned on the rear wall 4b;
It is fixed at 6. That is, each of these clamps 6
is supported by clamp guides 7 provided on each side wall 4a of the lower die block 4 so that it can move forward and backward toward the left and right ends of the upper die block 3, and is advanced by individual hydraulic cylinder units 8 installed on the frame 1 side. When the upper die block 3 is rotated, the left and right ends of the upper die block 3 are pressurized downward by the respective wedge actions. In addition, in the state fixed with the above-mentioned clamp 6, there is a gap between the contact surfaces of the upper and lower die blocks 3 and 4, excluding the arcuate surfaces in contact with each heading die 2.
By leaving a small gap 9, each heading die between the two blocks can be held even more strongly.

On the other hand, the tip of a die-suspending bolt 10 passing through the upper die block 3 from above is screwed into each forging die 2 sandwiched between the upper and lower die blocks 3 and 4. This bolt 10 is provided with an allowance at least in the front, back, right and left directions relative to the bolt through hole 11 of the upper die block 3, and does not contribute to fixing the forging die 2 to the upper die block 3, and is more secure than the hole 11. It has a head 10a with a large diameter.

Further, on the outer surface of each of the forging dies 2 described above, there is a vertical lock pin 12 that stands up from the lower die block 4 and passes through the upper die block 3 from above.
are engaged so as to intersect perpendicularly to the die center line, so that the locking pins 12 are engaged with the locking pins 12 at the locations on the outer surface of each heading die 2, thereby achieving close engagement with the locking pins 12. The engagement groove 2a having such a size and shape is formed in the direction of the dividing line with respect to the die outer circumferential circle. However, the above-mentioned lock pin 12 in this embodiment is tightly inserted into the lower die block 4 via a replaceable bushing 13 under the condition that it can be freely removed. It has a head 12a that is free to move forward, backward, left and right with respect to the hole 14, and has a larger diameter than the hole 14. Note that the above-mentioned tight insertion of the lock pin 12 into the lower die block 4 and tight engagement with the heading die 2 are achieved by reducing the fitting tolerance, and the free insertion of the pin into the upper die block 3 is achieved by reducing the fitting tolerance. , is achieved by increasing the fitting tolerance.

In the embodiment of FIGS. 1 to 3 constructed in this manner, the upper die block 3 is now fixed to the lower die block 4 by the left and right clamps 6, and therefore the heading die 2 is connected to both the upper and lower die blocks 3, 4. It is assumed that it is held by the lock pin 12. In this state, the impact load applied backward to the heading die 2 due to the striking of a heading punch (not shown) is transmitted from the rear wall 4b of the lower die block 4 and the back plate 5 to the frame 1 side, and is received. The subsequent recoil load applied forward is
It is transmitted from the lock pin 12 to the frame 1 side via the lower die block 4 and is received.

Therefore, the forging die 2 is firmly held against loads in any of the directions mentioned above, and the die suspension bolt 10 at this time has the following characteristics: No shearing load is applied.

When the left and right clamps 6 are retracted from the left and right ends of the upper die block 3 by the respective hydraulic cylinder units 8, the block is instantly released from its previous fixed state. Then, when the upper die block 3 is lifted by a crane or the like (not shown) and separated from the lower die block 4, the forging dies 2 are collectively removed from the lower die block 4 while being suspended by the individual die suspension bolts 10, as shown by the chain lines in Fig. 1. At the same time, in this embodiment, the large heads 12a of the lock pins 12 are hooked on the upper ends of the pin through holes 14,
The die is then pulled out from the lower die block 4.
After replacing the forging die 2 at another location, the upper die block 3 is again fitted into the lower die block 4, and the left and right clamps 6 are advanced, so that the block 3 is instantly fixed, and each lock pin 1 is
2, the engagement with the forging die 2 is completed simply by inserting the lower die block 4 individually.

Therefore, when replacing the forging die 2, there is no need to take any time to attach or remove the upper die block 3 or to handle the lock pin 12, so that the forging die 2 can be replaced quickly.

In the above embodiment, when the upper die block 3 is separated and the lock pin 12 is pulled out from the lower die block 4, the pin hangs down from the block 3, as shown by the chain line in FIG. This obstructs die exchange at other locations. However, if the lock pin 12 is removed every time the die is replaced, it is troublesome and there is a risk that it may be lost. Therefore, as shown in FIG. 4, a narrow annular groove 15 is provided near the lower end of the lock pin 12, and a click structure is provided in the upper die block 3 so that a small ball 16 is pushed out into the pin passage hole 14 by a spring 17. Provide a stop mechanism. According to this embodiment, when the lock pin 12 is pulled up to a height that does not interfere with die exchange, the small ball 16 engages with the annular groove 15 and the pin can be temporarily fixed at that height, so that the die can be removed. It does not get in the way of replacement, and there is no risk of losing it.

Further, in the embodiment shown in FIGS. 1 to 3 described above, the lock pin 12 inserted into the lower die block 4 is
There is a risk that it will naturally come out upwards due to vibration during heading molding. Therefore, as shown in Figure 4,
A narrow annular groove 15 is provided near the lower end of the lock pin 12, and a small ball 1 is provided in the lower die lock 4.
8 into the bush 13 by a spring 19 is provided. According to this embodiment, when the lock pin 12 is inserted into the lower die block 4 to a predetermined depth, the small ball 18 engages with the annular groove 15 and the pin can be temporarily fixed at that depth. Natural withdrawal of the pin can be prevented.

Furthermore, even if the lock pin 12 in the embodiment shown in FIGS. 1 to 3 is not fixed to the forging die 2 in the vertical direction, the lock pin 12 becomes tightly engaged with the die when the die is replaced. There is a concern that attachment and detachment of the forging die 2 to and from the upper die block 3 may be slightly hindered. Therefore, as shown in FIGS. 5 and 6, the engagement of the lock pin 12 with the forging die 2 is limited to less than half the circumference of the pin, and the engagement of the lock pin 12 with the die 2 is
The length range extending slightly above and below the engaging portion 12' including the engaging portion 12' has a semicircular cross section. According to this embodiment, by rotating the lock pin 12 by half a turn when exchanging the die, the engaging portion 1 of the pin is removed.
2' can be separated from the engagement groove 2a of the heading die 2,
The die 2 can be easily attached to and detached from the upper die block 3.

In addition, in the embodiment shown in FIGS. 1 to 3 described above, the lock pin 12 is inserted into and removed from the lower die block 4 every time the die is replaced.
Since it is inserted tightly into the block 4, there is a concern that inserting and removing it will be unexpectedly troublesome. Therefore, as shown in FIG.
is always fixed to the lower die block 4 side, and the head 12b of the pin is made to have the same diameter or smaller diameter than the other parts. According to this embodiment, when the upper die block 3 is separated, the lock pin 12 remains on the lower die block 4 side as shown in the figure, so that it is not necessary to insert or remove the lock pin 12 into the lower die block 4 when replacing the die. The lock pin 12 can be tightened to prevent the pin from coming off naturally due to vibration during heading forming.
It is not troublesome to insert or remove the holder into or out of the upper die block 3 because the two are in a free fitting relationship with sufficient circumference.

[Brief explanation of drawings]

Fig. 1 is a front view showing an embodiment of the present invention, Fig. 2 is a cutaway front view enlarging a part of Fig. 1, Fig. 3 is a longitudinal sectional side view taken from the - line in Fig. 2, 4 is a longitudinal sectional side view of a portion showing another embodiment, FIG. 5 is a partially cutaway front view showing still another embodiment, and FIG. FIG. 7 is a partially cutaway front view showing still another embodiment. 1...Frame, 2...Forging die, 2a...Forging die lock pin engagement groove, 3...Upper die block, 4...Lower die block, 5...Back plate, 6...Clamp, 7...Clamp guide , 8...Hydraulic cylinder unit, 10...Die suspension bolt, 11...Bolt through hole, 12...
Lock pin, 12'... Engaging portion of the lock pin having a semicircular cross section, 12a, 12... Head of the lock pin, 14... Pin through hole, 15... Annular groove, 1
6, 18... Small ball of click stop mechanism.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a device that holds a plurality of horizontal heading dies in parallel in the left and right direction with a die block divided into upper and lower halves, each of the above-mentioned heading dies is The die is suspended from the upper die block by a die suspension bolt that passes through the upper die block with sufficient circumference, and is vertically attached to the lower die block by passing through the upper die block and inserting it tightly into at least the lower die block. A lock pin raised vertically is engaged with the outer surface of the forging die in a direction perpendicular to the die center line, and clamps are provided on both left and right sides of the upper die block to press downwardly the left and right ends of the block. , a forging die holding device for a multi-stage forging machine, characterized in that the device is disposed together with a hydraulic cylinder unit for moving the clamp forward and backward with respect to the left and right ends thereof. (2) A practical use characterized in that the lock pin has a large-diameter head at the upper end, and when the upper die block is separated from the lower die block, the lock pin is latched to the upper die block by the head and pulled out from the lower die block. A heading die holding device according to claim 1 of the patent registration claim. (3) The engagement of the lock pin with the outer surface of the forging die is stopped within a range of less than half the circumference of the pin, and the length range extends slightly above and below the portion of the lock pin that engages with the forging die, including the portion that engages with the forging die. but,
The forging die holding device according to claim 1, which is characterized by having a semicircular cross section. (4) Utility model registration claim 1, characterized in that the lock pin is always fixed to the lower die block side in a vertically erect state, and the head of the pin is the same diameter as or smaller than the other parts. The heading die holding device according to item 1.